You could take off a rocker and try to push down on the pushrod. You'd be able to feel the spring in a hydraulic lifter, but not on a solid lifter.
They all had hydraulic lifters. To determine if it has roller lifters, you'd probably need to take off the intake manifold and have a look.
Hydraulic lifters would be STOCK from the factory. On the 84 engine.
YES it does and it is a roller cam and hydraulic lifters.
The 4.3L would have 12 hydraulic lifters.
Yes it does. Chevy did not use solid lifters in that engine.
If it has hydraulic lifters, you do not adjust the valves.
There is no adjustment- the engine has hydraulic valve lifters.
It's not recommended to change just the lifters. The cam and lifters should be replaced together. To get at the lifters, you can remove the rocker covers and intake manifold, loosen the rockers enough to get the pushrods out, then pull out the lifters.
The 1990 will take flat hydraulic.
A 97 Chevy Cavalier uses standard hydraulic type lifters. They utilize oil pressure to control the height of the lifters and provide a small clearance across the camshaft.
If you're going stock lifters, they're hydraulic and you don't mess with them. If you've replaced with solids (which is a really good idea), you'll need to get that information from the people who manufactured the lifters/cam.
Not that difficult but the 350, 5.7Liter has hydraulic lifters and you must be sure the oil hole is lined up with oil hole in block